SN74HCS165PWR

Shift Registers Overview

The SN74HCS165PWR is an 8-bit parallel-load shift register from the HCS logic family, manufactured by Texas Instruments. It operates within a supply voltage range of 2 V to 6 V and supports an extended ambient temperature range from -40°C to +125°C. The device features Schmitt-trigger inputs for noise rejection and balanced CMOS push-pull outputs capable of ±7.8 mA drive current at 6 V. It is housed in a 16-pin TSSOP package with dimensions of 5.00 mm x 4.40 mm.

Shift Registers Feature Summary

• Schmitt-trigger inputs provide high tolerance to slow or noisy input signals through defined hysteresis.

Shift Registers Applications

• Increasing the number of available inputs on a microcontroller
• Parallel-to-serial data conversion for system controllers

Shift Registers Procurement Notes

Verify that the ordering suffix 'PW' corresponds specifically to the TSSOP-16 package variant. Confirm compliance with RoHS standards and lead times directly with the manufacturer or authorized distributors. Ensure the component meets the required operating temperature range and voltage specifications for your specific application environment before finalizing procurement.

Shift Registers Selection Notes

Select this component when interface expansion is required to reduce microcontroller pin usage. The HCS series offers improved noise immunity compared to standard HC logic due to Schmitt-trigger inputs. Verify that the output drive capability and load capacitance requirements align with the connected peripheral devices to ensure signal integrity.

Shift Registers Part Context

This part belongs to the SN74HCS165 family of 8-bit parallel-load shift registers. The family includes variants with different packages such as SOIC (D), WQFN (BQB), and SOT-23-THN (DYY). All variants share the same core functionality but differ in physical footprint and thermal characteristics.

Shift Registers Replacement Considerations

Direct replacements include other SN74HCS165 variants with different packages: SN74HCS165D (SOIC-16), SN74HCS165BQB (WQFN-16), and SN74HCS165DYY (SOT-23-THN-16). Ensure the substitute matches the required package type for PCB compatibility.

Shift Registers FAQ

How do Schmitt-trigger inputs benefit this shift register?

They allow the device to tolerate slow or noisy input signals by providing hysteresis, which prevents false triggering caused by signal fluctuations near the threshold voltage.

What happens to unused inputs on this device?

Unused inputs must not be left floating. They should be terminated to either VCC or ground to prevent undefined operational states and excessive power consumption.